Window sizes for new construction and newer homes, how do they

[Jonathan W.]

In most construction Basically what I am asking is

Does the #, size and total amount of opening space per square foot in regards to windows on houses accumulate to a pre determined number or is it based on every house specifically designed with window location and variation in mind.

How do they figure out how many windows and what sizes? Is there a minimum or code about how many may be placed?